Saturn has the lowest density of any planet in the solar ... | funfact.wiki

Saturn has the lowest density of any planet in the solar system—so low it would float, given a big enough ocean. Its average density is 0.687 g/cm³, about 30% below water's. Made of hydrogen and helium, the lightest elements, it holds little mass for its volume.

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Pluto hasn't completed a full Orbit around the sun since its 1930 discovery. With an orbital period of about 248 years, it will finish its first lap in 2178. Counting from its 2006 demotion as a Solar System Planet, it will complete a full orbit in 2254.

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Earth's closest planet on average isn't Venus but Mercury. Bigger orbits spend longer on the far side of the Sun, so average distance grows. Mercury's tiny orbit keeps it near every planet. Earth–Mercury averages 1.04 AU, Earth–Venus 1.14 AU. The "Whirly Dirly Corollary."

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Venus is the only planet in the Solar System where a day is longer than a year. It takes about 243 Earth days to spin once on its axis, but only 225 days to orbit the Sun. It also spins backward, so the Sun rises in the west and sets in the east.

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